Spring AOP 日志和缓存

Question

我正在使用一个简单的切面来记录方法输入和输出参数。

package com.mk.cache;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import java.util.Arrays;

@Aspect
@Component
public class LoggingAspect {
    @Around("within(@com.mk.cache.LoggedIO *) && execution(* *(..))")
    public Object logAroundPublicMethod(ProceedingJoinPoint joinPoint) throws Throwable {
        String wrappedClassName = joinPoint.getSignature().getDeclaringTypeName();
        Logger LOGGER = LoggerFactory.getLogger(wrappedClassName);
        String methodName = joinPoint.getSignature().getName();
    LOGGER.info("LOG by AOP - invoking {}({})", methodName, Arrays.toString(joinPoint.getArgs()));
    Object result = joinPoint.proceed();
    LOGGER.info("LOG by AOP - result of {}={}", methodName, result);
        return result;
    }
}

这是由此注释附加的。

package com.mk.cache;

public @interface LoggedIO {

}

我使用这种机制来记录像这样的方法的输入和输出（注意@LoggedIO）：

package com.mk.cache;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

@Service
@LoggedIO
public class CachedService {

    private static final Logger LOGGER = LoggerFactory.getLogger(CachedService.class);

    @Cacheable("myCacheGet")
    public int getInt(int input) {
        LOGGER.info("Doing real work");
        return input;
    }
}

我也使用Spring Cache。这里有一个示例应用程序。

package com.mk.cache;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;

@SpringBootApplication
@EnableCaching
public class CacheApplication implements CommandLineRunner {

    private static final Logger LOGGER = LoggerFactory.getLogger(CacheApplication.class);

    public static void main(String[] args) {
        SpringApplication.run(CacheApplication.class, args);
    }

    @Autowired
    private CachedService cachedService;

    @Override
    public void run(String... args) throws Exception {
        LOGGER.info("cachedService.getInt(1)={}", cachedService.getInt(1));
        LOGGER.info("cachedService.getInt(1)={}", cachedService.getInt(1));
    }
}

输出结果如下:

LOG by AOP - invoking getInt([1])
Doing real work
LOG by AOP - result of getInt=1
cachedService.getInt(1)=1
cachedService.getInt(1)=1

我的问题是，当我第二次调用LOGGER.info("cachedService.getInt(1)={}", cachedService.getInt(1));时，缓存中的值被使用，但输入和输出参数未被记录，因为缓存是第一层包装。有没有可能以某种方式配置LoggingAspect成为第一个包装器，这样我就可以同时使用AOP日志记录和Spring缓存？

- Michal Krasny

---

看这个：https://dev59.com/fprga4cB1Zd3GeqPggOG - reos

Answer 1

只需实现Spring的Ordered接口，在getOrder()方法中返回1。

@Aspect
@Component
public class LoggingAspect implements Ordered {
    @Around("within(@com.mk.cache.LoggedIO *) && execution(* *(..))")
    public Object logAroundPublicMethod(ProceedingJoinPoint joinPoint) throws Throwable {
        String wrappedClassName = joinPoint.getSignature().getDeclaringTypeName();
        Logger LOGGER = LoggerFactory.getLogger(wrappedClassName);
        String methodName = joinPoint.getSignature().getName();
    LOGGER.info("LOG by AOP - invoking {}({})", methodName, Arrays.toString(joinPoint.getArgs()));
    Object result = joinPoint.proceed();
    LOGGER.info("LOG by AOP - result of {}={}", methodName, result);
        return result;
    }

    @Override
    public int getOrder() {
        return 1;
    }

}

阅读更多内容，请点击此处。第11.2.7章节。

- Tomáš Winkler